Cold Bending Forming of Cable Trays

Cold bending forming is an automated process that shapes metal sheets or coils into cable trays using sequential rolling, bending, punching, and cutting without heating the material.

Overview of the Process

The cold bending forming process transforms flat metal strips, such as galvanized steel, aluminum, or stainless steel, into finished cable trays through mechanical deformation at room temperature. This method preserves the material's strength and surface finish while allowing precise shaping into U-shaped, C-shaped, ladder-type, or perforated trays for electrical cable management .

Key Steps in Cold Bending Forming

1. Uncoiling and Leveling: Metal coils are unrolled and flattened using a leveling machine to remove internal stresses and ensure a smooth surface .
2. Feeding and Punching: Servo-driven feeding systems guide the metal strip into punching stations for holes, slots, or bolt securing points. This step ensures proper drainage, heat dissipation, and assembly compatibility .
3. Roll Bending/Forming: The strip passes through multiple sets of rollers (typically 16–22) that sequentially bend the metal into the desired cross-sectional shape. The process can handle symmetrical or asymmetrical profiles and thicknesses ranging from 0.8mm to 3mm .
4. Cutting and Discharge: After forming, the tray is cut to the required length using hydraulic or mechanical blades and collected on a discharge platform .

Machinery and Automation

Cold bending forming machines are highly automated, often integrated into production lines with feeding, leveling, punching, forming, and cutting units. They are controlled via PLC systems and touch-screen HMIs, allowing precise adjustments, high-speed production (up to 20 m/min), and minimal operator intervention (typically two operators per line), . Dual motors and modular designs enhance efficiency, adaptability, and ease of maintenance .

Advantages of Cold Bending Forming

• High Precision: Ensures accurate dimensions and consistent quality across batches .
• Material Efficiency: Cold forming avoids heat treatment, preserving mechanical properties and reducing energy consumption .
• Versatility: Capable of producing various tray types, including ladder, perforated, solid, and custom profiles .
• Automation and Productivity: Integrated systems allow continuous production with synchronized punching and forming, reducing labor costs and increasing throughput .

Applications

Cable trays produced via cold bending are widely used in industrial plants, commercial buildings, power stations, substations, and high-rise residential projects. They support electrical, control, and communication cables, providing structural integrity, heat dissipation, and corrosion resistance when made from galvanized or stainless steel . In summary, the cold bending forming process is a precise, automated, and efficient method for manufacturing cable trays, offering flexibility in design, high production speed, and consistent quality suitable for diverse industrial and commercial applications .